#include <iostream>
#include <string>
#include <regex>

int main()
{
    std::string str = "/numbers/1234";
    //匹配以 /numbers/起始,后面跟了一个或者多个数字字符的字符串，并且在匹配的过程中提取这个匹配到的数字字符串
    std::regex e("/numbers/(\\d+)");
    std::smatch matches;

    bool ret = std::regex_match(str, matches, e);
    if(ret == false)
    {
        return -1;
    }
    for(auto &s : matches)
    {
        std::cout << s << std::endl;
    }
    return 0;
}